Detergent tablet



FIG. 1 is a perspective view of the detergent tablet showing my new design;

FIG. 2 is a front elevational view thereof, the back, right side, and left side elevational views, respectively, being identical thereto;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is bottom plan view thereof. 

The ornamental design for a detergent tablet, as shown and described. 